Electric switch.



R. 0. W. LUNDIN.

AELECTRIC SWITCH.

APPLICATION' FILED ocT. 15. 1911.

Patented J an. 14, 1919,

immmmm UNITED STATES PATENT oEEioE.

BAHN-AR O. W. LUNDIN, 0F NEW' BRITAIN, CONNECTICUT, ASSIGNOR T0 THETRUMBULL ELECTRIC MANUFACTURING COMPANY, OF PLAINVILLE, CONNECTICUT, ACORPO- RATION OF CONNECTICUT.

ELECTRIC SWITCH.

Specification of Letters Patent.

Patented J an. 14.-, 1919.

To all whom it may concern:

Be it known that I, RAGNAR AO. W. LUN- DIN, a citizen of the UnitedStates of America, residing at New Britain, Connecticut, have invented anew and useful Electric Switch, of which the following is aspecification.

My invention relates particularly to switches of the push button typeand aims primarily to provide a switch of this character which will besimple, small and coml pact in construction, which will be quick in itsaction, which'will require a relatively short movement to effect itsoperation, and which will have a high current-carrying capacity. Aspecial feature of the invention is the construction of the snap switchmech` amsm in such form that it may be disposed wholly at one end of theswitch base to enable the mounting of a supplementary or auxiliaryswitch, such asV a rotary snap switch on the other end of the insulatingBriefly, the invention comprises in combination with a supporting framemounted on the base, a push button slidingly mounted lin said frame andconnected by means of a switchthrowing spring with a swinging contactmaking lever vpivoted on the frame at one side of said push button. Thissliding push button isconnected at its upper end with a rocker, whichmay have a second push button engaged with .its opposite end, and thisrocker is preferably pivoted on apost provided by an upstanding part onthe supporting frame.

In the accompanying drawings, I have illustrated the invention embodiedin the preferred form, but I would have it understood that changes andmodifications may bel made without departing from the true spirit andscope of the invention.

In said drawing:

Figure 1 is a side view of the switch with the insulating base portionbroken away and shown in section to disclose the snap switch mechanismtherein.

Fig. 2 isa top plan view of the lower half or main part of the switchbase and parts carried thereby.

Fig. 3 is a bottom view of the same to illustrate the several crossconnections.

Fig. 4 is a cross sectional view taken sub- :sBtantially on the plane ofthe line 4 4 of ig. 2. v

Fig. 5 is a similar viewwith the switch parts in a diierent position.

Fig. 6 is an enlarged detail view of the snap switch mechanism removedfrom the base, the push button being broken away for ack of space.

Considering the drawing now more in detail, 7 designates the supportingframe set down in a recess 8 in the switch base 9 and made up of baseportion 10 with upstanding side parts 11 bent toward each other at-their upper ends to form a top portion 12.

This frame 1s shown secured in place by means of screws 13 passed upthrough the bottom of thel insulating base into engagement with the baseportion of the frame. Formed in the top and bottom portions of thisframe are guide slots 14" and 15 for the sliding stem or shank 16 of thepush button 17, the upper guide slot 14 being open at the side of theframe as clearly shown in Fig. 6 and the lower guide slot 15 ex' tendingentirely through the base portion of the frame as is also shown in thisView.

The stem of the push button has a rearwardly bent angled anchorage forone end of the switch throwing spring 19, the opposite end of thisspring being connected at 20 to the free end of a contact making lever21 which is pivoted in the frame at 22. The pivot guides for this levermay be formed as open slots' in the side arms 11 of the frame anddisposed in the edge ofthe frame opposite that edge in which the lopenguide slot 14 is provided. This enables an assemblage of these parts ybysimply engaging the pivots 22 of the lever sidewisein the pivot slots inone edge of the frame and the dropping of the push button shank inthelower guide opening 15 therefor, the spring 19 serving when connectedwith these parts to hold them in their open bearings.

The throwing springis connected with the push button slide at a point 23which lug 18 which forms an' the contact making lever in the case illusetrated by providing it with a contact arm 24 secured to the swinginglever 21 by an insulated joint at 25 and projecting past the pivotalpoint of the lever and beyond the opposite side of the frame, where itis adapted to form a bridge between a pair of relatively stationarycontacts 26-27. The oscillating movement of the contact making lever islimited by stop portions 28 on the opposite edges of the lever, adaptedto en gage with the top and bottom edge portions of the frame, asclearly shown in Fig. 4, and the reciprocatory movements of the pushbutton may be limited by the upper and lower Vedge portions of theanchorage lug, engaging the top and bottom of the frame as indicated byFigs. 4, 5 and 6. The push' button stem may further be notched asindicated at 29 in Fig. 6 where it engages in the upper vopen guide slot14, the ends of such notch also being utilized as stops when so desired.

Another feature of the supporting frame is the provision of it 'with alaterally offset Aextended upstanding post 30 for the switch operatingrocker 31 which is shown pivoted thereto at a point intermediate itsends at 32. This rocker is shown engaged with the upper portion of thepush button shank 16 by means of a lug 33 which is hooked into anopening34 provided for it in the push button shank.

The opposite end of the switch operating rocker is shown engaged withthe second push button 35 by means of a fork 36 em-' bracing a fia-nge37 on the lower end of the push button.I This second push button is alsoindicated as slidably engaged on a spindle 38 which may be the spindlevof a rotary snap switch mechanism such as that lindicated generally at39 in Fig. 2.

From this description it will be apparent that as the push buttons areoperated the inovably supported end of the switch throwing spring iscarried past the center of support of the contact making lever whichwill cause said lever to be alternately snapped in opposite directions,thus quickly making anol breaking contact. The shiftable end of thespring need be carried but a slight distance to each side of the pivotalcenter of the lever, and hence the push button movement necessary for4effecting snapping of the switch need only be relatively slight. Thispush button movement is an advantage in that the buttons need notproject so far,

' pivoted on the supporting of the sliding stem of said push button and'a switch throwing spring connected at one they are easier to operate.and the parts can be made smaller and disposed more compactly.

The connection between the two switches are illustrated in a general wayin Figs. 2 and 3 wherein 40, 41, 42 and 43 designate the four switchterminals, terminal 40 bein connected by the back strap 44 with one othe rotary switch contacts 45, terminal 41 being connected directly withthe stationary snap switch contact 26, terminal 42 being connected by aback strap 46 with the rotary snap switch contact 47 and `terminal 43be-I ing connected with the rotary switch contact 48.

I claim- 1. In a switch ofthe character set forth, a switch base, aSupporting frame mounted on the base at one end thereof and having anupstanding post disposed substantially centrally of the base, a rockerpivoted on said upstanding post, push buttons connect- I ed with theopposite ends of said rocker, one of said push buttons havin a dependentstem slidably engaged in le supporting frame, a swinging contact makinglever frame at one side end to the free end of the swinging contactmaking lever and connected at its opposite end to the sliding pushbutton stem at a point which in the reciprocation of such stem travelspast the center ofV pivotal support of the contact making lever.

2. In a switch of the character described,

'.a switch base, a supporting frame mounted on the switch base andcomprising a supporting base and upstanding arms rising therefrom, oneof said arms having a laterally directedupstanding ypost and said baseportion and arms having guiding slots for a reciprocating slide, arocker pivoted on the upstanding post, a push button connected with oneend of the rocker and having a shank portion slidably guided in theslots in the supportingframe, a contact making lever pivoted in thesupporting frame at one side of said stem, a switch throwing springconnected between said 4stem and the free endl of the contact makinglever and a push button connected with the opposite end of the rocker.

3. Tn a switch of the character set forth, a switch base, an opensupporting frame mounted in an upright position on said base having aguiding slot extending through thebase portion thereof and a guidingslot izo end of the said Contact making lever, said tension springholding the operating slide engaged in the open guiding slot.

Ll. In a switch of the character set forth, a switch base, a switchframe mounted thereon and provided With spaced guide slots, an operatingslide Working in said guide slots and having an angularly turnedanchorage lug, a Contact making lever piv- Copiel of this patent may beobtained for five cents enh, by addressing the oted on the frame, aswitch tension spring connected with the free end of said pivoted leverand with the anchorage lug of the slide, cooperating stopvshoulders onthe slide and frame limiting the recprocatory movements of the slide andcoperating stops on the Contact making lever and frame limiting theoscillatory movements of said lever.

RAGNAR O. W. LUNDIN.

Comminioner of latenti,

Wallington, D. 0."

